Desc & Show Tables

Duration: 3 min

This video lesson is available to enrolled students.

Return to /learn/GATE-GUIDANCE-BY-SANCHIT-SIR/database-management-systemdbms/sql/ddl-dml-dcl-tcl-desc/asset-desc-show-tables after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Discrete Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic
  2. DataBase Management System/DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control
  3. Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  4. Computer Architecture: Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design
  5. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  6. C Language: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  7. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. Computer Networks: Introduction to CN, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics
  10. Theory Of Computation/Automata Theory: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  11. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  12. Engineering Mathematics: Permutation and Combination, Linear Algebra, Calculus, Probability, Statistics
  13. General Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Mensuration and Geometry, Mental Ability, Arithmetic, Profit and Loss, Powers and Exponents (Surds and Indices), Average, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Syllogisms, Venn Diagram, Seating Arrangements, Blood Relations, Directions (Direction Test), Analogy, Algebra, Time and Work, Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Cubes & Dices, Ranking, Order and Sequence, Mixture and Alligation, Age Problems, Clock, Selection Decision Table (Decision Making), Data Arrangement
  14. English (Verbal Aptitude): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Preposition, Direct and Indirect Speech, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Completion (Fill in the blanks), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Correction (Error Correction), Verbal Analogy (Word Based Analogy), Conjunction, Interjection, Verb, Articles, Adverb, Modals, Sentence Construction
  15. Live Classes Recordings(Earlier Batch): GATE 2026 Live Class
  16. Full Mock Test:
  17. Previous Year Papers:
  18. GATE 2026 Counselling: Counselling and Guidance Sessions
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video is a lecture on SQL commands for database management, focusing on the DESCRIBE and SHOW TABLES commands. The first segment explains the DESCRIBE command, which acts as an 'X-ray' to inspect a table's structure. It details the command's syntax, `DESCRIBE table_name;`, and shows an example output for a 'Student' table, breaking down the columns: Field (column name), Type (data type), Null (whether NULL values are allowed), Key (indexing/primary key info), Default (default value), and Extra (additional info). The lecture also compares it to other commands: `SHOW TABLES` lists all tables in a database, and `SELECT * FROM table` displays the actual data. The second segment transitions to the SHOW TABLES command, explaining that in RDBMS like Oracle, it is not a direct command but is implemented using system views. It presents a table comparing three purposes: listing personal tables, accessible tables, and system-wide tables, each with its corresponding SQL query using `SELECT table_name FROM` and the appropriate system view (e.g., `user_tables`, `all_tables`, `dba_tables`). The lecturer emphasizes that Oracle uses these views instead of a direct SHOW TABLES command, unlike MySQL.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a slide titled 'DESCRIBE Command'. The lecturer explains that this command is used to check a table's column names, data types, and constraints before writing complex queries. The syntax is shown as `DESCRIBE table_name;`. An example output for a 'Student' table is displayed, showing columns for Field, Type, Null, Key, Default, and Extra. The lecturer explains what each column reveals: Field is the column name, Type is the data type (e.g., int, varchar), Null indicates if the column allows NULL values, Key identifies indexing or primary key information (e.g., PRI for Primary Key), and Default shows the default value if none is provided. The slide also includes a table comparing the DESCRIBE command with SHOW TABLES and SELECT * FROM commands, outlining their purposes and what they display.

  2. 2:00 – 3:16 02:00-03:16

    The video transitions to a new slide titled 'Show Tables Command'. The lecturer explains that in RDBMS like Oracle, the SHOW TABLES operation is not a direct command but is implemented using system views. The slide presents a table with three purposes: listing Personal Tables, Accessible Tables, and System-Wide (DBA) tables. For each purpose, it provides the syntax pattern (`SELECT table_name FROM`), the actual command (e.g., `SELECT table_name FROM user_tables;`), and what it shows. The lecturer explains that `user_tables` shows only tables created by the user, `all_tables` shows tables the user has access to, and `dba_tables` shows every table in the database, requiring DBA privileges. The lecturer uses a red pen to circle and emphasize key parts of the text and code on the slide.

The lecture progresses from a fundamental command for inspecting table structure (DESCRIBE) to a command for listing tables (SHOW TABLES), highlighting a key difference in implementation between database systems. It teaches that DESCRIBE provides a detailed blueprint of a single table, while SHOW TABLES provides a list of tables. The core synthesis is that while MySQL has a direct SHOW TABLES command, Oracle uses system views like `user_tables`, `all_tables`, and `dba_tables` to achieve the same result, with the scope of the list determined by the user's privileges. This demonstrates the importance of understanding the specific syntax and system architecture of the RDBMS being used.

Loading lesson…